在探究凸透镜成像规律时，小捷用了9个红色的发光二极管按“F”字样镶嵌排列在白色的板上代替蜡烛作光源，实验装置如图所示：
—Why didn't you cry for help when you were robbed (被抢劫)?
—If I opened my mouth, they might find my four gold teeth. That would be !
